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diff --git a/Source/WebKit2/Shared/DrawingAreaInfo.h b/Source/WebKit2/Shared/DrawingAreaInfo.h
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+++ b/Source/WebKit2/Shared/DrawingAreaInfo.h
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+/*
+ * Copyright (C) 2010 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DrawingAreaInfo_h
+#define DrawingAreaInfo_h
+
+#include "ArgumentCoders.h"
+#include "Connection.h"
+
+namespace WebCore {
+    class IntRect;
+    class IntSize;
+}
+
+namespace WebKit {
+
+struct DrawingAreaInfo {
+    enum Type {
+        None,
+        Impl,
+        ChunkedUpdate,
+#if USE(ACCELERATED_COMPOSITING)
+        LayerBacked,
+#endif
+#if ENABLE(TILED_BACKING_STORE)
+        Tiled,
+#endif
+    };
+    
+    typedef uint64_t Identifier;
+
+    DrawingAreaInfo()
+        : type(None)
+        , identifier(0)
+    {
+    }
+
+    DrawingAreaInfo(Type type, Identifier identifier)
+        : type(type)
+        , identifier(identifier)
+    {
+    }
+    
+    Type type;
+    Identifier identifier;
+};
+
+} // namespace WebKit
+
+namespace CoreIPC {
+template<> struct ArgumentCoder<WebKit::DrawingAreaInfo> : SimpleArgumentCoder<WebKit::DrawingAreaInfo> { };
+}
+
+#endif // DrawingAreaInfo_h